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AQA Biology GCSE Unit 4
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a

Draw and label the parts of a typical bacterial cell
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1
g




h

Diffusion is:
The movement of water particles from a high water concentration to a lower water concentration across a partially
permeable membrane
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The movement of particles from a low concentration to a higher concentration
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• a human gamete contain?







Sperm cells are specialised cells
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j

n

3
...

5
...




k


What are ‘embryonic’ stem cells?


f




water molecules


o

What is osmosis?



Name 2 medical conditions that could be treated with
embryonic stem cells in the future
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2
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2
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1
...






Light microscopes have objective lenses
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b

i

1
...
1 Cell Biology
Draw and label a typical animal cell
...
A
piece of chicken was contaminated with 5 bacteria; how
many bacteria will there be on the chicken after 3 hours?

Where in the body are adult stem cells found and how do they differ from embryonic stem cells?



The unit ‘centimetres’ is written as ‘cm’
...
Give two
advantages of cloning plants
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1
...




3
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k
Why do some people object to embryonic stem cell
research?

q





5
...
Describe how the
root hair cell is adapted
to carry out its function
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How
many chromosomes would be in an elephant:
• liver cell?

o





• animals



j

Which has a bigger ‘surface area to volume’ ratio, an
elephant or a mouse?





• contains the genetic information?

0
...
003; 

μm: 

Describe how active transport is used by:
• plants

Write each of the following numbers in standard form
...

1
...
What does ‘resolution’ mean?

l

How do prokaryotic cells differ from eukaryotic cells?


2
...










Describe 2 ways in which active transport is different
to diffusion
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State 2 factors that affect the rate of diffusion
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2
...


m

My main areas for improvement in this unit are:




s

AQA Biology GCSE Unit 4
...


d

Draw and label the parts of a typical bacterial cell
...

1
...


ribosomes

cytoplasm

2
...

3
...


cell membrane
h

Diffusion is:

cell wall

The movement of water particles from a high water concentration to a lower water concentration across a partially
permeable membrane
...

chloroplast

The movement of particles from a low concentration to a higher concentration
...


List 5 important keywords from this unit
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Eukaryotic/Prokaryotic

• mitosis?
1
...


23 single (haploid)

2
...


Sperm cells are specialised cells
...


Light microscopes have objective lenses
...


2
...
Mitosis
4
...
Osmosis

Describe an advantage of using therapeutic cloning to
treat disease
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Finally, the cell splits into two identical ‘daughter’ cells
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3
...


c

i

2
...
Oxygen

To produce new cells for growth and repair
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Undifferentiated cells found in the early embryo
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What is osmosis?

The acrosome contains enzymes to digest through the egg

1
...


2
...




o

sugar molecules

My main areas for improvement in this unit are:

o

AQA Biology GCSE Unit 4
...

ribosomes

nucleus

d
A bacterium can divide once every 20 minutes
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n

2500; 2
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003; 3 x 10-3
4 200 000; 4
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00000006; 6 x 10-8

pm: picometres

e

Plants can be cloned from meristem cells
...


j

Which has a bigger ‘surface area to volume’ ratio, an
elephant or a mouse?

o

Mouse

Farmers can produce clones of a desired plant quickly and
cheaply
...


To obtain mineral ions from the soil

What is the equation for calculating the magnification
of an image?

• animals

Nucleus

concentrations, from the small intestine
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k

b

2
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Diffusion

q

They believe that all embryos have the potential to become

3
...


4
...
Resolution

• ovum?
28
c

Describe 3 ways that exchange surfaces are adapted to
their function
...
Large surface area

Has a large surface area for the rapid absorption of water

f
Electron microscopes have better resolution than light
microscopes
...
Thin walls

The ability to distinguish between 2 points, so higher

3
...


Describe 2 ways in which active transport is different
to diffusion
...


i

μm: micrometres

To absorb nutrients (e
...
glucose), when they are at low

Root hair cells are specialised cells
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mm: millimetres

• contains the genetic information?

An elephant sperm cell contains 28 chromosomes
...
Can only turn into certain cell types, such as blood cells
...
What do each
of the following units represent?

• plants

• controls the movement of substances in and out of the cell?

Where in the body are adult stem cells found and how do they differ from embryonic stem cells?

they don’t have mitochondria or chloroplasts
...
Moves against a concentration gradient (low to high)

State 2 factors that affect the rate of diffusion
...
Temperature

2
...
Concentration gradient

m

My main areas for improvement in this unit are:




s



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